<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // var add = prompt('请输入用户名：');
        // var mima = prompt('请输入密码：');
        // while (add != 'admin' || mima != '123456') {
        //     add = prompt('请输入用户名：');
        //     mima = prompt('请输入密码：');
        // }
        // alert('登录成功');

        do {
            var add = prompt('请输入用户名：');
            var mima = prompt('请输入密码：');
        } while (add != 'admin' || mima != 123456)
        alert('登录成功');
    </script>
</head>

<body>

</body>

</html>